Exosomal circ_001895 from lung cancer cells drives M2 macrophage polarization via the miR-20a-5p/JAK1/STAT3 axis to promote tumor progression. Zunqiao Wang Bin Wang Yun Gao Jinyuan Liu Keping Wang a Department of Thoracic Surgery, Nanjing Medical University Affiliated Brain Hospital, Nanjing, Jiangsu, Chinab Department of Pharmacy, Nanjing Medical University Affiliated Brain Hospital, Nanjing, Jiangsu, Chinac Department of Thoracic Surgery, Nanjing Medical University, The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital, Nanjing, Jiangsu, China